logged into minecraft without being logged in

so in the launcher i can see im logged into minecraft and have my skins selected and when i press play when i then try to join a server it says (failed to log in: the authentication servers are currently not reachable please try again) and if i then make a singleplayer world then my skin is automatically set to the kai skin but my skin is still selected btw its every version it just wont let me select a different version